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Date and Time of the Query: 2019-02-22 T23:40:07 PST
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For refcode 1988ApJ...324..749F:
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Copyright by American Astronomical Society. Reproduced by permission
1988ApJ...324..749F A FIVE-BAND STUDY OF SPIRAL GALAXIES: X-RAY, OPTICAL, NEAR- AND FAR- INFRARED, AND RADIO CONTINUUM CORRELATIONS G. FABBIANO, I. M. GIOIA, AND G. TRINCHIERI Harvard-Smithsonian Center for Astrophysics Received 1986 December 5; accepted 1987 June 30 ABSTRACT We present a statistical analysis of the relationships between radio continuum, far- and near-infrared emission, blue light, and X-ray emission of spiral galaxies. We find differences between early (Sa-Sb) and late-type (Sc-Sm/I) spiral galaxies, both in the strengths of the correlations and in the functional relationships between the variables. In particular, the correlations of the radio continuum and far-infrared luminosities with the other luminosities present more scatter in early-type spirals. These also tend to be overluminous in the blue, H, and X-rays for a given radio luminosity when compared with late-type spirals. A similar effect is seen at least for the H luminosity when compared with the far-infrared. These effects could be explained with the presence of large bulge components in early-type spirals contributing to the blue, H, and X-ray emission, but not to the radio continuum and the far-infrared. The relationships between the variables in late-type spirals suggest a common disk/arm origin for the emission at different wavelengths. Their functional dependences could be consistent with a steeper initial mass function and an obscured compact starburst component in the more luminous galaxies. If the latter dominates the far-infrared emission in these galaxies, the close link between far-infrared and radio emission suggests that the sources of cosmic-ray electrons belong predominantly to the younger Population I component in high-luminosity late-type spirals. However, a link between the radio emission and an older disk component cannot be ruled out in the low-luminosity galaxies. The previously reported link between X-ray and radio emission is also comparatively strong and might imply a physical or evolutionary connection between X-ray and cosmic-ray sources. Subject headings: galaxies: photometry - galaxies: stellar content - galaxies: X-rays - radio sources: galaxies
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